jQuery UI Timepicker is a jQuery UI time picker plugin built to match with other official jQuery UI widgets. Based on the existing date picker, it will blend nicely with your form and use your selected jQuery UI theme. The plugin is very easy to integrate in your form for time (hours / minutes) inputs. – jquery.ui.timepicker.js

jQuery UI is a curated set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library. – jquery-ui.min.js